Have Motorola & love it. Communicate all the time. We have 2 cameras. Sound is good but buttons sometimes get stuck and you have to unstick. Also have the withings monitor for traveling that connects to iPhone/iPad. It's great, but you need a strong wifi signal & Bluetooth on your iPad etc. if the signal is weak it won't work.

I have the ibaby monitor but also a cheap sound monitor. You can't rely solely on the iPhone one because a)if your phone dies and b) the Internet goes out. I like the I baby one and it works good, it will alert you if baby moves or makes a sound so it's pretty cool but get a back up for unexpected outages it may have.